Quickly-detachable valve cap



Nov. 20, 1928. 1,692,521

- N. L. BUCKMAN QUICKLY DETACHABLE VALVE CAP Filed Dec. 23, 1925 ligniPatented y Nov. 2o, 192.28.y

UNITED STATES 1,692,621 PATENT 'oF1-1c1-;.

NELLIE L. BUCKMAN, or SANTA ANA, CALIFORNIA.`

QUICKLY-DETACHBLE VALVE CAP. v

Application mea nee'emberes, 1925. serial Nov 77,225.

This invention relates to improvements in adapted to be applied totirevalve stems.

An object of this invention is to provide a valve dust cap which canbeapplied by merely forcing the cap downwardly over the valve stem andwhich will automatically engage and firmly gri the valve stem so that itCany not be loosene or lost. y

A further object of the invention isto provide a quickly attachable anddetachable i valve dust cap as above described, which upon slightrotation will close and effectively seal the end of the Valve Stem toprevent any leakaOe.v lalVith the foregoing and otherl objects in viewwhich will be made manifest in the following detailed description andspecifically pointed out, 1n the appended claims, reference proved valvecap is shown as applied, the,

valve cap being shown in vertical section,

Fig. 2 is a vertical section through the Lvalve cap when in its removedor detached position, Fig. 3 is a side elevation of the valve cap, Fig.4 is a vertical section through the shell constituting a part of theimproved valve cap, Fi 5 is a top plan View vof the movable memer whichis disposed within the shell,

Fig. 6 is a side elevation of the movable member,

Fig. 7 member,

Fig. 8 is a vertical section taken on the line 8-8 of Fig. 5,

Fig. 9 is a vertical section through the rubis-a bottom plan View of themovable ber washer or gasket disposed within the movable member.

Referring to the accompanying drawings wherein similar referencecharacters designate similar parts throughout, the improved valve capconsists of a cylindrical shell 10 having its top4 closed and its bottomopen. The interior surface of the shell is cylindrical, and adjacent itsbot-tom there is formed an annular recess 11, which may be formed byup-Y setting the bottom of the shell. Within the shell there is disposeda movable member consisting of a disc 12 which has downwardly extendingresilient arms 13 arranged about its edges. These resilient arms areseparated from each other, as indicated at 14, and adjacent theirupperends they are of reduced valve caps and particularly to dust capsvwidth, as indicated at 15, so'that their resiliency or spring may beincreased. On the bottom of eachv of the arms 13 there are formedinwardly extending jaws 16 which cooperate to present an interiorannular surface of a diameterI substantially equal to the diameter ofthe reduced portion R of the valve stem S5 On the exterior or outersurface of each of the 'arms 13 there isV formed a projection 17, andeach of these projections is capable of being received within the1interior annular recess 11. The opposed faces of the jaws 1G arethreaded, as indicated'at 18, and these threads are complementary" tothe threads on the reduced portion R of the valve stem.' Between thedisc 12and t-he inwardly extending jaws 16 there is positioned a rubberwasher' or gasket 19, preferably having a depending annular flange 20positioned against the interior surfaces of lthe arms 18.' On the bottomof the gasket 19 at its center there is preferably arranged a recess 21`capable of receiving` the end of thestem or the pin of the valvedisposed within the valve stem S.

The operation of the improved' valve cap is as follows: Vhen the valvecap Ais detached lor removed from the valve stem S, the movable memberassumes the position shown in Fig..2, the arms 13 springing outwardlyand causing the projections 17 to enter the recess 11.` In this manne-rthe jaws are separated from each other a sufficient distance to 'permitthe reduced portion R of the valve stem to enter between them. Inapplying the valve cap to the valve stem it is so positioned as to causethereduced portion R of the valve stem to enter between the jaws andengage the bottom of the gasket 19. By forcing the shell downwardly, thelmovable member will be caused to rise within the shell 10, and as theprojections 17 slide out of the recess 11, they cause the jaws tocontract and engage upon the reduced portion R of the valve stem. The

initial movement of the projections 17 when slipping out ofthe recess 11causes the contraction of the'jaws, and any 'further sliding sov In thismanner the valve cap can be applied wardly overrthewalve stem. v\If.it,is` desired to pnventany leakage out d'the wlmastelll, the shellmay be rotated after it has been applied. The threads 18 meshing withthe threads on the retlueed-portienfR-eerewlhe movable member downwardlyon the valve stem and thus cause theupper edge df-the valve stem tofirmly engage the underside of the Gasket 19, and thus preventany'leake. `I? thestern or pinof the ,valve within e valvesternprojeetsfslightly, it isreceivable withintlie recess.2`l,fso that `itWillrnot depressed to Ymove the valve o the seat. lt will be foundthatahalf orathreefquarber .revolution of the shelhis sufficient tocanse the firm engagementbetween the valve stem and gasket. The.friction of the arms 13 y aloek for preventiraer ,themovable memberVagainst the interior surfaceof the-shell ssnffient to` canse themovablememberfto bef rotated wththe shell. Q y

Inrexnovng the valve cap,1t is merely neclesnaryxe liftthefshell10,-eansingtlie movable memberto slide dewnsvardly within it ,and whenit reaches a predeterminedposition, -in-thisinstance the bottemef-tlieshell, the ,arms 13 eztpaml causing the prejeetons `17 to enter therecess ,11, thnsiexpandingthe 'jaws andpermittin the removal of the cap.The

expansionof t `e arms 13 cansingthe projections 17 to enter therecess,l1 else serves ,as

from dropping out of the Shell.

\ y It .will be understoodtthat'.various changes maybe made .in thedetailfof construction without departing from thefspirt, pr seope'oflthe -invent1on as -deined lby .the appended engaged by the top of avalve stem and held@ ,1n position whensaid shell is forced downwardlythereover, lsaidshell,presenting' interior .surfaces vadapted to rengageupon said 'jaws and force Vthe same into en agement with `thesdes ofsaid-valve lstem `vv en said shell `is orced thereover.

' 3. :Ina valveeap, a shell havinganinterior Vannular recess l'ormedtherein adjacentthe bottom thereof, a disc disposed Within' the shell,depending resilient arms on said disc,

.and projections onsaid armsadapted toenter said recess, the lower endsof 'said armsbeing bent inwardly at substantially right anv gles toprovidejaws engageable on the sides ofa valve stem, Wherebysaid discwillbe held by said stem against longitudinal movement when said shellis forcedthereover andsaid jaws willbe `forced into engagementwithjsa'id valve stein said projeetions when-the lat- ,terare'forcedoutnf said recess.

In testimony whereofl `have signed my ,name ,to this'l specification.

NELLIEL. BUoirMAN.

